1 . 已知实数
,函数
.
(1)(i)若函数
在
上恰有一个零点,求实数
的值;
(ⅱ)当
时,证明:对任意的
,恒有
.
(2)当
时,方程
有两个不同的实数根
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdae41a842c4b331a75219ebe04ff56.png)
(1)(i)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e64ba8593537d13752713ecc882cd5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe45993e6bd636a4f34886bb3d72f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c20eaed28d5406d2448b170b8774b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec54969940d5aac61c538e14d990761f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe0bb3eb03296f12a276c5f7d96c8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b698452fda78774ad4b77594713567c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264b93aa6b21f14144bf1f77be3831e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1e760b9a9f407ab080f0367920dc50.png)
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2022-03-24更新
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2卷引用:天津市津衡高级中学2022届高三下学期4月月考数学试题